Me and my sister have a similar relationship. She blows up then wonders why every is against her. She clams she has no memory but she remember's what other people have said. She doesn't believe anyone that tells her the thing she has done wrong. Even though we're family I keep her at a safe distance. I only talk about safe stuff even if she asks my opinion I do not give it. I'm very careful of what I say to her as it can be used as ammunition later. I avoid riding with her but I do help her. Never money, always positive. I can't/won't cut ties because it hurts my parents so bad. Plus I wouldn't want to do that to my niece and nephews. My son says I'm an enabler but if I cut off my family I would have no family left.